How to create .pfx file from certificate and private key?

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You will need to use openssl.

openssl pkcs12 -export -out domain.name.pfx -inkey domain.name.key -in domain.name.crt

The key file is just a text file with your private key in it.

If you have a root CA and intermediate certs, then include them as well using multiple -in params

openssl pkcs12 -export -out domain.name.pfx -inkey domain.name.key -in domain.name.crt -in intermediate.crt -in rootca.crt

If you have a bundled crt file that you use, for example, with nginx, you can pass that in along with the cert all in one:

cat domain.name.crt | tee -a domain.name.bundled.crt
cat intermediate.crt | tee -a domain.name.bundled.crt
cat rootca.crt | tee -a domain.name.bundled.crt
openssl pkcs12 -export -out domain.name.pfx \
  -inkey domain.name.key \
  -in domain.name.bundled.crt

You can install openssl from here: openssl

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